Covid-19 contact tracing app switched to Apple-Google model

The video discusses the development of a test track and trace system, highlighting its national significance and the technical challenges faced, particularly with app compatibility on iPhones. It emphasizes the importance of accurate distance measurement in contact tracing apps and concludes with a focus on finding effective solutions to save lives.

What does the text imply about the scale and complexity of the national undertaking for the contact tracing system?

What is the significance of the statement 'what works will save lives'?